basic: Fix incompatible type for arguments errors in C2X

GCC-13 -std=gnu2x FTBS with:

error: incompatible type for argument 3 of ‘_hashmap_free’
(cherry picked from commit a4a1569ff1e9ab62996f8b42dcc14a09f91b5715)

src/basic/hashmap.c

@@ -1751,7 +1751,7 @@ HashmapBase* _hashmap_copy(HashmapBase *h  HASHMAP_DEBUG_PARAMS) {
         }
 
         if (r < 0)
-                return _hashmap_free(copy, false, false);
+                return _hashmap_free(copy, NULL, NULL);
 
         return copy;
 }